Question 1

The only reliable way a researcher can make statistical inferences from a sample to a population is to use non-probability sampling methods.

Accepted Answer

A) True 
 B)False  False

Question 2

At a computer manufacturing company,the actual size of computer chips is normally distributed with a mean of 1 cm and a standard deviation of 0.1 cm.A random sample of 12 computer chips is taken.Above what value do 2.5% of the sample means fall?

Accepted Answer

1.057

Question 3

For sample size 1,the sampling distribution of the mean will be normally distributed

Accepted Answer

A) only if the shape of the population is symmetrical. 
B) regardless of the shape of the population. 
C) only if the population values are positive. 
D) only if the population is normally distributed. 
A) only if the shape of the population is symmetrical. 
B) regardless of the shape of the population. 
C) only if the population values are positive. 
D) only if the population is normally distributed. D

Question 4

Which of the following is NOT a reason for drawing a sample?

Accepted Answer

A) A sample is less time consuming than a census. 
B) A sample is less cumbersome and more practical to administer. 
C) A sample is less costly to administer than a census. 
D) A sample is usually not a good representation of the target population. 
A) A sample is less time consuming than a census. 
B) A sample is less cumbersome and more practical to administer. 
C) A sample is less costly to administer than a census. 
D) A sample is usually not a good representation of the target population.

Question 5

The University Registrar mailed a survey to a total of 400 students.The sample included 100 students randomly selected from each of the first-year,second-year,third-year,and honours level students on campus last term.What sampling method was used?

Accepted Answer

A) Simple random sample. 
B) Systematic sample. 
C) Stratified sample. 
D) Cluster sample. 
A) Simple random sample. 
B) Systematic sample. 
C) Stratified sample. 
D) Cluster sample.

Question 6

Instruction 7-2
The mean selling price of new homes in a country town over a year was $115,000.The population standard deviation was $25,000.A random sample of 100 new home sales from this town was taken.
-Referring to Instruction 7-2,what is the probability that the sample mean selling price was between $113,000 and $117,000?

Accepted Answer

0.5763 usi

Question 7

The distribution of the number of loaves of bread sold per day by a large bakery over the past 5 years has a mean of 7,750 and a standard deviation of 145 loaves.Suppose a random sample of n = 40 days has been selected.What is the approximate probability that the average number of loaves sold in the sampled days exceeds 7,895 loaves?

Accepted Answer

The answer of The distribution of the number of loaves...

Question 8

The owner of a fish market has an assistant who has determined that the weights of rainbow trout are normally distributed,with mean of 3.2 kilograms and standard deviation of 0.8 kilogram.If a sample of 64 fish yields a mean of 3.4 kilograms,what is the probability of obtaining a sample mean this large or larger?

Accepted Answer

A) 0.4987 
B) 0.0001 
C) 0.0013 
D) 0.0228 
A) 0.4987 
B) 0.0001 
C) 0.0013 
D) 0.0228

Question 9

Which of the following sampling methods is a probability sample?

Accepted Answer

A) Judgement sample. 
B) Quota sample. 
C) Convenience sample. 
D) Stratified sample. 
A) Judgement sample. 
B) Quota sample. 
C) Convenience sample. 
D) Stratified sample.

Question 10

The evening host of a dinner dance reached into a bowl,mixed all the tickets around,and selected the ticket to award the grand door prize.What sampling method was used?

Accepted Answer

A) Simple random sample. 
B) Systematic sample. 
C) Stratified sample. 
D) Cluster sample. 
A) Simple random sample. 
B) Systematic sample. 
C) Stratified sample. 
D) Cluster sample.

Question 11

Suppose μ = 80 and σ = 20 for a population.In a sample where n = 100 is randomly taken,95% of all possible sample means will fall above 76.71.

Accepted Answer

A) True 
 B)False

Question 12

Instruction 7-6
According to an article,19% of the entire Australian population have high-speed access to the Internet.Random samples of size 200 are selected from the Australian population.
-Referring to Instruction 7-6,among all the random samples of size 200,________% will have between 9% and 29% who have high-speed access to the Internet.

Accepted Answer

The answer of Instruction 7-6
According to an article,19% of the...

Question 13

Instruction 7-4
According to a survey,only 15% of customers who visited the web site of a major retail store made a purchase.Random samples of size 50 are selected.
-Referring to Instruction 7-4,what proportion of the samples will have less than 15% of customers who will make a purchase after visiting the web site?

Accepted Answer

The answer of Instruction 7-4
According to a survey,only 15% of...

Question 14

Sampling error can be reduced by taking larger sample sizes.

Accepted Answer

A) True 
 B)False

Question 15

Instruction 7-6
According to an article,19% of the entire Australian population have high-speed access to the Internet.Random samples of size 200 are selected from the Australian population.
-Referring to Instruction 7-6,among all the random samples of size 200,90% will have less than ________% who have high-speed access to the Internet.

Accepted Answer

22.56 usin

Question 16

At a computer manufacturing company,the actual size of computer chips is normally distributed with a mean of 1 cm and a standard deviation of 0.1 cm.A random sample of 12 computer chips is taken.What is the probability that the sample mean will be below 0.95 cm?

Accepted Answer

0.0416 usi

Question 17

The lecturer of a business statistics class wanted to find out the average amount of time per week her students spent studying for the class.Among the 50 students in her class,20% were first-year students,50% were second-year students and 30% were third-year students.She decided to draw 2 students randomly from the first-year students,5 randomly from the second-year students and 3 randomly from the third-year students.This is an example of a systematic sample.

Accepted Answer

A) True 
 B)False

Question 18

A study at a university in New South Wales reveals that,historically,45% of their students are minority students.If random samples of size 75 are selected,the standard error of the proportions of students in the samples who are minority students is ________.

Accepted Answer

The answer of A study at a university in New...

Question 19

If the population distribution is symmetric,the sampling distribution of the mean can be approximated by the normal distribution if the samples contain at least 15 observations.

Accepted Answer

A) True 
 B)False

Question 20

The standard error of the mean

Accepted Answer

A) decreases as the sample size increases. 
B) is never larger than the standard deviation of the population. 
C) measures the variability of the mean from sample to sample. 
D) All of the above. 
A) decreases as the sample size increases. 
B) is never larger than the standard deviation of the population. 
C) measures the variability of the mean from sample to sample. 
D) All of the above.

The only reliable way a researcher can make statistical inferences from a sample to a population is to use non-probability sampling methods.

At a computer manufacturing company,the actual size of computer chips is normally distributed with a mean of 1 cm and a standard deviation of 0.1 cm.A random sample of 12 computer chips is taken.Above what value do 2.5% of the sample means fall?

For sample size 1,the sampling distribution of the mean will be normally distributed

Which of the following is NOT a reason for drawing a sample?

The University Registrar mailed a survey to a total of 400 students.The sample included 100 students randomly selected from each of the first-year,second-year,third-year,and honours level students on campus last term.What sampling method was used?

Which of the following sampling methods is a probability sample?

The evening host of a dinner dance reached into a bowl,mixed all the tickets around,and selected the ticket to award the grand door prize.What sampling method was used?

Suppose μ = 80 and σ= 20 for a population.In a sample where n = 100 is randomly taken,95% of all possible sample means will fall above 76.71.

Sampling error can be reduced by taking larger sample sizes.

At a computer manufacturing company,the actual size of computer chips is normally distributed with a mean of 1 cm and a standard deviation of 0.1 cm.A random sample of 12 computer chips is taken.What is the probability that the sample mean will be below 0.95 cm?

A study at a university in New South Wales reveals that,historically,45% of their students are minority students.If random samples of size 75 are selected,the standard error of the proportions of students in the samples who are minority students is ________.

If the population distribution is symmetric,the sampling distribution of the mean can be approximated by the normal distribution if the samples contain at least 15 observations.

The standard error of the mean

Introduction and Data Collection

Presenting Data in Tables and Charts

Numerical Descriptive Measures

Basic Probability

Some Important Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Hypothesis Testing: Two Sample Tests

Analysis of Variance

Simple Linear Regression

Introduction to Multiple Regression

Time-Series Forecasting and Index Numbers

Chi-Square Tests

Multiple Regression Model Building

Decision Making

Statistical Applications in Quality and Productivity Management

Further Non-Parametric Tests

Filters

Exam 7: Sampling Distributions

The only reliable way a researcher can make statistical inferences from a sample to a population is to use non-probability sampling methods.

At a computer manufacturing company,the actual size of computer chips is normally distributed with a mean of 1 cm and a standard deviation of 0.1 cm.A random sample of 12 computer chips is taken.Above what value do 2.5% of the sample means fall?

For sample size 1,the sampling distribution of the mean will be normally distributed

Which of the following is NOT a reason for drawing a sample?

The University Registrar mailed a survey to a total of 400 students.The sample included 100 students randomly selected from each of the first-year,second-year,third-year,and honours level students on campus last term.What sampling method was used?

Which of the following sampling methods is a probability sample?

The evening host of a dinner dance reached into a bowl,mixed all the tickets around,and selected the ticket to award the grand door prize.What sampling method was used?

Suppose μ = 80 and σ = 20 for a population.In a sample where n = 100 is randomly taken,95% of all possible sample means will fall above 76.71.

Sampling error can be reduced by taking larger sample sizes.

At a computer manufacturing company,the actual size of computer chips is normally distributed with a mean of 1 cm and a standard deviation of 0.1 cm.A random sample of 12 computer chips is taken.What is the probability that the sample mean will be below 0.95 cm?

A study at a university in New South Wales reveals that,historically,45% of their students are minority students.If random samples of size 75 are selected,the standard error of the proportions of students in the samples who are minority students is ________.

If the population distribution is symmetric,the sampling distribution of the mean can be approximated by the normal distribution if the samples contain at least 15 observations.

The standard error of the mean

Introduction and Data Collection

Presenting Data in Tables and Charts

Numerical Descriptive Measures

Basic Probability

Some Important Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Hypothesis Testing: Two Sample Tests

Analysis of Variance

Simple Linear Regression

Introduction to Multiple Regression

Time-Series Forecasting and Index Numbers

Chi-Square Tests

Multiple Regression Model Building

Decision Making

Statistical Applications in Quality and Productivity Management

Further Non-Parametric Tests

Filters

Suppose μ = 80 and σ= 20 for a population.In a sample where n = 100 is randomly taken,95% of all possible sample means will fall above 76.71.